If you want to get an idea of the scale of the known universe, from the quantum foam all the through to the observable universe, then this is the web site for you. It starts out at one meter with the average human and like-sized objects. Scroll to the left and you start getting smaller and smaller. Scroll to the right and larger objects come into view.
I especially liked when you arrive at 10^8. You see the Earth and most of the other planets and the larger moons in our solar system.
Here's a link to the site:
The Scale of the Universe 2. It also has nice, Zen-like ambient music which you can turn off, if you wish.
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